Itunes wont detect my ipod touch?

My ipod has been coming up as a camera for a while now but it has been fine and i could still sync it in itunes. but now it wont even show my ipod in itunes, but it does show up in my computer. When i plug it into my computer it does say its charging. I have tried everything it said to do on the apple support site and nothing has worked. If any one has something to resolve this it would be greatly appriciated!